Scaffold bracket for ladders



I. l. THORNE SCAFFOLD BRACKET FOR LADDERS March 6, 1951 Filed Feb. 10,1947 /NVENTOR IRV/N THORNE ATTORNEY Patented Mar. 6, 1951 UNITED STATESPATENT OFFICE SCAFFOLD BRACKET FOR LADDERS Irvin I. Thorne, Portland,Oreg.

Application February 10, 1947, Serial No. 727,605

1 Claim.

This invention relates generally to ladders and scaffolding andparticularly to a scaffold bracket for ladders.

The main object of this invention is to provide a convenient and simpleform of bracket whereby ladders can be successfully used to supportscaffold planks, and in which the workman is enabled to select withgreater precision the desired height to which the scaffold plank is tobe set.

The second object is to expedite the work of mechanics by enabling themto set their scaffold at the correct level or one best adapted for thework at hand.

The third object is to construct a bracket of the class described whichcan be used in conjunction with the ordinary step ladder or a ladderhaving the conventional round rungs.

I accomplish these and other objects in the manner set forth infollowing specifications as illustrated in the accompanying drawing, in

which:

Fig. l is a fragmentary side elevation of the upper portion of a stepladder showing my device applied thereto.

Fig.2 is a plan of Fig. 1.

Fig. 3 is a fragmentary side elevation of the upper portion of aconventional round rung ladder showing my device applied thereto.

Fig. 4 is a front elevation of Fig. 3.

Fig. 5 is a perspective view of the device.

Similar notes of reference refer to the same or similar parts throughoutthe several views.

Referring in detail to the drawing, there is shown in Fig. 1 and Fig. 2a common form of step ladder having main rungs Ill between which aremounted the steps II. To the rungs In is secured a top step I2 by meansof the plates I3, hinged to the plates I3 are the brass rungs I4.

The problem is to support the scaffold plank I5 from the step ladder. Inmany cases the step II may be too low and the step I2 may be too high.

In order to take care of this condition, I have provided a pair ofupright members I6 having the turned ends II provided with thedownturned hooks I8 as shown clearly in Fig. 5. The lower end I9 iscurved and has an upwardly turned portion 20 which is free to swingunder the step I I when the downturned hook I8 is hinged to the step I2by passing through the hole 2|. It will be noted that there are twomembers I6, and that across same ar secured the horizontal straps 22 and23, which are secured to the member I6 by the screws 24 or in any otherconvenient manner.

The positioning of the straps 22 and 23 are such as to divide thedistance between the top of the step II and the top of the step I2 intothree parts giving the user four positions to select from instead of twoas is customarily the case.

In Fig. 3 and Fig. 4 are shown the common form of ladder 25 with thesupporting rungs 26 together with the hinging rung 21 and the usual steprungs 28 and 29. In this form of ladder the device is inverted; that is,the end I9 hinges from the rung 28 while the opposite end bears againstthe rung 29, as shown the plank 30 rests upon the strap 23. It can beseen from the foregoing that in either of the forms of ladder employed,the operator has an opportunity to select more closely the height atwhich his scafiold plank I5 or 39 is to rest.

I am, of course, aware that numerous forms of scaffold brackets havebeen constructed in the past. I, therefore, do not claim such devicesbroadly but I do intend to cover such forms and modifications thereof asfall fairly within the appended claim.

I claim:

A scaffold bracket consisting of a pair of upright members having a pairof plank supporting straps holding said members in parallel relationship, said members having one pair of ends turned substantiallynormal thereto, equalling the width of a stepladder tread, each of saidends having a square turned hook, the opposite ends of said memberhaving rounded hooks formed therein opposed to said square hooks.

IRVIN I. THORNE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,758,319 Holmes May 13, 19302,140,828 Carle Dec. 20, 1938 2,329,643 Nelson Sept. 14, 1943

